On 21 Jan 2002 18:34:26 -0500, Warp wrote:
> Simon Adameit <gom### [at] gmxde> wrote:
>: Then why does it disappear if you add double_illuminate ?
> 
>   'double_illuminate' "fixing" it is a clear symptom that it has something
> to do with normals, but what confuses me is that the normals should not
> depend on camera location. If the object stays static and the light source
> stays static and there's no phong/specular finish, the lighting should remain
> the same regardless of the point of view.

But the normal we choose can change with camera position.  We don't always
just take the object's word for it.

-- 
plane{-z,-3normal{crackle scale.2#local a=5;#while(a)warp{repeat x flip x}rotate
z*60#local a=a-1;#end translate-9*x}pigment{rgb 1}}light_source{-9red 1rotate 60
*z}light_source{-9rgb y rotate-z*60}light_source{9-z*18rgb z}text{ttf"arial.ttf"
"RP".01,0translate-<.6,.4,.02>pigment{bozo}}light_source{-z*3rgb-.2}//Ron Parker

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